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diff --git a/xfa/fwl/core/ifwl_thread.h b/xfa/fwl/core/ifwl_thread.h
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+++ b/xfa/fwl/core/ifwl_thread.h
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+// Copyright 2014 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef XFA_FWL_CORE_IFWL_THREAD_H_
+#define XFA_FWL_CORE_IFWL_THREAD_H_
+
+// The FWL thread/app code contains three parallel inheritance hierarchies,
+// which reference each other via pointers as follows:
+//
+//                                           m_pImpl
+//      (nonesuch)              IFWL_Thread ----------> CFWL_ThreadImp
+//                                   |      <----------      |
+//                                   A       m_pIface        A
+//                                   |                       |
+//      (nonesuch)              IFWL_NoteThread         CFWL_NoteThreadImp
+//                                   |                       |
+//                                   A                       A
+//                m_pIface           |                       |
+//      CFWL_App --------------> IFWL_App                CFWL_AppImp
+//
+
+#include "xfa/fwl/core/fwl_error.h"
+
+class CFWL_ThreadImp;
+class IFWL_NoteDriver;
+
+typedef struct FWL_HTHREAD_ { void* pData; } * FWL_HTHREAD;
+
+class IFWL_Thread {
+ public:
+  // These call into polymorphic methods in the impl; no need to override.
+  void Release();
+  FWL_ERR Run(FWL_HTHREAD hThread);
+
+  CFWL_ThreadImp* GetImpl() const { return m_pImpl; }
+  void SetImpl(CFWL_ThreadImp* pImpl) { m_pImpl = pImpl; }
+
+ protected:
+  virtual ~IFWL_Thread() {}
+
+ private:
+  CFWL_ThreadImp* m_pImpl;
+};
+
+#endif  // XFA_FWL_CORE_IFWL_THREAD_H_